634 



PROCEEDINGS OF THE ACADEMY OF 



[Dec, 



Vitrina alaskana 191 



limpida 191,483 



pfeifferi 191 



Volvulella sp 339 



Wala mitrata 455 



palmarum 455 



Wyethia amplexicaulus 32, 38, 78, 89 



Xanthium strumarium var. echi- 



natum 78, 84 



Xylica 328 



abbreviate 328 



kikuyuensis 328 



kilimandjarica 328 



caligulata 328 



Xysticus ferox 451 



formosus 451 



gulosus 452 



triguttatus 451 



Yersinia 325 



Zamites velderi 18 



Zaphysema columellata 573 



macmurryi 126, 127 



Zauschneria californica 78, 85 



Zea mais 78, 83 



Zelotes atra 441 



depressa 441 



frigida 441 



Zilla montana 450 



Zoarces angularis 15 



Zonites algirus 470 



kopnodes 4^4 



lasvigatus 483 



perfragilis 483 



rugeli 484 



Zonitidae 191, 469, 478 



Zonitoides arborea 192, 527-532 



excavata 470 



milium meridionalis 192 



minuscula 192, 526-529, 531 



nitida 470 



singleyana 526, 529, 530, 532 



Zonyalina jalapensis 470 



Zygadenus nuttalli 40, 78, 92 



Zygoballus parvus 456 



sexpunctatus 455 



